Hanna Instruments

Phosphorus Ultra Low Range Colorimeter HI736 Hanna Checker - Marine Water

In stock
Out of stock

- +

Monitoring phosphorus concentration in saltwater is important because it can cause corrosion if levels are too high. The Hanna HI736 Checker HC Handheld Colorimeter for Phosphorus ULR bridges the gap between simple chemical test kits and professional instrumentation. Accurate, affordable and easy to use. First, zero the instrument with your water sample. Next, add the reagents. Last, place the vial into the Hanna Phosphorus Checker, press the button and read the results. Done.



  • Easier to use and more accurate than chemical test kits
  • Large, easy to read digits Auto shut-off
  • Dedicated to a single parameter
  • Designed to work with HANNA's reagents
  • Uses 10 mL glass cuvettes
  • Small Size, Big Convenience
  • Fits in the palm of your hand



  • Range: 0 to 200 ppb
  • Resolution: 1 ppb
  • Accuracy: ±5 ppb ±5% of reading
  • Light Source: LED @ 525 nm
  • Light Detector: Silicon photocell
  • Environment: 0 to 50°C (32 to 122°F); RH max 95% non-condensing
  • Battery Type: (1) 1.5V AAA
  • Auto-off: After 2 minutes of non-use and 10 seconds after reading
  • Dimensions: 81.5 x 61 x 37.5 mm (3.2 x 2.4 x 1.5")
  • Weight: 64 g (2.25 oz.)
  • Method: Adaptation of Standard Method for Examination of Water and Wastewater, 20th edition, Ascorbic Acid method


Replacement Reagents - HI736-25 Phosphorus ULR Replacement Reagents


Which is better to test for, Phosphate or Phosphorus? Want to find out - Click Here


PDF IconHanna Checker Phosphorus Ultra Low Range Manufacturer's Manual


PDF IconHanna Checker Phosphorus Ultra Low Range Manufacturer's Literature

Write Your Own Review
You're reviewing:Phosphorus Ultra Low Range Colorimeter HI736 Hanna Checker - Marine Water
Your Rating
Only registered users can write reviews. Please or

Product Questions

Why is there a timer? Is this the time it gives me to Dissolve the powder? Or does the sample have to be in the colorimeter the whole time?
Question by: iBerne on Nov 24, 2017, 6:30 PM
The timer is just an additional feature to make sure you let the reagent fully dissolve and react. The sample does not need to stay in the meter the whole time, only when readings are being taken.
Thanks for the question and have a great day!
Answer by: Charlie on Nov 25, 2017, 8:38 AM
Which checker should I use for a reeftank the hi713 or hi736 to check for phosphate?
Question by: John on May 28, 2016, 11:19 AM
Great question!
We use the Hi713 in most cases as it is easier to use and read over the phosphorus which requires additional calculation to convert to phosphate.
Answer by: Connor on Jun 3, 2016, 1:35 PM